diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8d65098b..418a368c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -25,15 +25,15 @@ variables:
                desktop-file-utils enchant2-devel folks-devel gcr-devel
                glib2-devel gmime-devel gnome-online-accounts-devel
                gspell-devel gtk3-devel iso-codes-devel json-glib-devel
-               itstool libcanberra-devel libgee-devel libhandy-devel
-               libsecret-devel libunwind-devel libxml2-devel
+               itstool libappstream-glib-devel libcanberra-devel libgee-devel
+               libhandy-devel libsecret-devel libunwind-devel libxml2-devel
                libytnef-devel sqlite-devel webkitgtk4-devel
   FEDORA_TEST_DEPS: Xvfb tar xz
 
   # Ubuntu packages
   UBUNTU_DEPS: meson build-essential valac
                desktop-file-utils gettext iso-codes itstool
-               libcanberra-dev libenchant-dev libfolks-dev
+               libappstream-glib-dev libcanberra-dev libenchant-dev libfolks-dev
                libgcr-3-dev libgee-0.8-dev libglib2.0-dev
                libgmime-2.6-dev libgoa-1.0-dev libgspell-1-dev
                libgtk-3-dev libhandy-0.0-dev libjson-glib-dev
diff --git a/INSTALL b/INSTALL
index eb7a0c74..556ef8b0 100644
--- a/INSTALL
+++ b/INSTALL
@@ -44,9 +44,9 @@ Install them by running this command:
         desktop-file-utils enchant2-devel folks-devel gcr-devel \
         glib2-devel gmime-devel gnome-online-accounts-devel \
         gspell-devel gtk3-devel iso-codes-devel json-glib-devel \
-        libcanberra-devel libgee-devel libhandy-devel libsecret-devel \
-        libunwind-devel libxml2-devel libytnef-devel sqlite-devel \
-        webkitgtk4-devel
+        libappstream-glib-devel libcanberra-devel libgee-devel \
+        libhandy-devel libsecret-devel libunwind-devel libxml2-devel \
+        libytnef-devel sqlite-devel webkitgtk4-devel
 
 Installing dependencies on Ubuntu/Debian
 ----------------------------------------
@@ -55,7 +55,7 @@ Install them by running this command:
 
     sudo apt-get install meson build-essential valac \
         desktop-file-utils iso-codes gettext libcanberra-dev \
-        libenchant-dev libfolks-dev libgcr-3-dev libgee-0.8-dev \
+        libappstream-glib-dev libenchant-dev libfolks-dev libgcr-3-dev libgee-0.8-dev \
         libglib2.0-dev libgmime-2.6-dev libgoa-1.0-dev libgspell-1-dev \
         libgtk-3-dev libjson-glib-dev libhandy-dev libsecret-1-dev \
         libsqlite3-dev libunwind-dev libwebkit2gtk-4.0-dev \
diff --git a/meson.build b/meson.build
index 1353c2f4..84d95b74 100644
--- a/meson.build
+++ b/meson.build
@@ -54,6 +54,9 @@ sqlite = dependency('sqlite3', version: '>= 3.12')
 webkit2gtk = dependency('webkit2gtk-4.0', version: '>=' + target_webkit)
 
 # Secondary deps - keep sorted alphabetically
+# We need appdata.its from appstream-glib:
+# https://gitlab.gnome.org/GNOME/geary/issues/439
+appstream_glib = dependency('appstream-glib', version: '>=0.7.10')
 enchant = dependency('enchant-2', version: '>=2.1', required: false) # see below
 folks = dependency('folks', version: '>=0.11')
 gck = dependency('gck-1')